feat: sync gpt-5 model ratio and support new reasoning effort

setting/ratio_setting/model_ratio.go

@@ -449,6 +449,10 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 			}
 			return 4, true
 		}
+		// gpt-5 匹配
+		if strings.HasPrefix(name, "gpt-5") {
+			return 8, true
+		}
 		// gpt-4.5-preview匹配
 		if strings.HasPrefix(name, "gpt-4.5-preview") {
 			return 2, true